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ACT Math : How to find the solution to an equation

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Example Questions

Example Question #31 : How To Find The Solution To An Equation

What is the slope of the line 7y – 4x = 27

Possible Answers:

$-\frac{7}{4}$

$-\frac{4}{7}$

$\frac{4}{7}$

$\frac{7}{4}$

Correct answer:

$\frac{4}{7}$

Explanation:

Adding 4x to both sides of the equation and dividing by 7 yields a slope of 4/7.

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Example Question #31 : How To Find The Solution To An Equation

If you drove at an average speed of 78 miles per hour, what distance, in miles, did you drive in 140 minutes?

Possible Answers:

1.8

156

4,680

182

Correct answer:

182

Explanation:

140 minutes is 7/3 of an hour. Multiplied by the speed of 78mph, we obtain 182 miles traveled.

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Example Question #1801 : Act Math

3x + 9i² – 5x = 17

What is x?

Possible Answers:

–1

–4

–13

Correct answer:

–13

Explanation:

i = $\sqrt{-1}$

i²= -1

3x + 9i² – 5x = 17

3x + 9(–1) – 5x = 17

–2x – 9 = 17

–2x = 26

x = –13

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Example Question #1802 : Act Math

Solve for x:

3x + 4y = 26

–5x + 12y = 14

Possible Answers:

$-\frac{7}{32}$

$\frac{7}{32}$

$-\frac{32}{7}$

$\frac{32}{7}$

$\frac{46}{7}$

Correct answer:

$\frac{32}{7}$

Explanation:

Eliminate y and solve for x.

3x + 4y = 26 (multiply by –3)

–5x + 12y = 14

(–3)3x +(–3) 4y = (–3)26

–5x + 12y = 14

–9x +-12y = –78

–5x + 12y = 14

–14x + 0y = –64

x = –64/–14 = 32/7

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Example Question #32 : How To Find The Solution To An Equation

Michael is counting his money. He notices he has one more quarter than he does dimes, as well as one less nickel than dimes. The total cash he has is $2.60. How many coins does he have in total?

Possible Answers:

Correct answer:

Explanation:

The general form for money problems is $V_{1}N_{1} + V_{2}N_{2} + V_{3}N_{3} =$ $\$\ total$ , where is the value of the coin and is the number of coins.

Let = # of dimes, x + 1 = # of quarters, and x - 1 = # of nickels.

So, 0.10x + 0.25(x + 1) + 0.05(x - 1) = 2.60 , and solving gives x = 6 . Therefore there are 6 dimes, 7 quarters, and 5 nickels, giving 18 coins in total.

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Example Question #33 : How To Find The Solution To An Equation

What value of will satisfy the equation

5(z+3)= 2z+12

Possible Answers:

3/7

-3/7

Correct answer:

Explanation:

The answer is .

The solve this equation, first distribute the to obtain 5z+15= 2z+12

Proceed to subtract from both sides to get 3z+15=12

Subtract from both sides to leave 3z=-3

Divide both sides by to get the answer, z=-1

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Example Question #1805 : Act Math

Given that 2x+1=3x-2 , what is the value of ?

Possible Answers:

$\frac{3}{2}$

$\frac{5}{7}$

Correct answer:

Explanation:

First, we must solve the equation for by subtracting from both sides:

2x-2x+1=3x-2x-2

1=x-2

Then we must add to both sides:

1+2=x-2+2

3=x

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Example Question #31 : Algebra

Internet service costs $0.50 per minute for the first ten minutes and is $0.20 a minute thereafter. What is the equation that represents the cost of internet in dollars when time is greater than 10 minutes?

Possible Answers:

10 + 0.20 (x-10)

5.00 + 0.20 (x-10)

5.00 + 0.20 (x)

5.00

5 + 0.20 (x+10)

Correct answer:

5.00 + 0.20 (x-10)

Explanation:

The first ten minutes will cost $5. From there we need to apply a $0.20 per-minute charge for every minute after ten. This gives

$\$0.20(x-10)+5$ .

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Example Question #33 : Algebra

John goes on a trip of kilometers at a speed of kilometers an hour. How long did the trip take?

Possible Answers:

c+b

b-c

b/c

c/b

c-b

Correct answer:

b/c

Explanation:

If we take the units and look at division, miles/(miles/hour) will yield hours as a unit. Therefore the answer is b/c .

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Example Question #34 : How To Find The Solution To An Equation

With a $25\ mph$ head wind a plane can fly a certain distance in five hours. The return flight takes an hour less. How fast was the plane flying?

Possible Answers:

$125\ mph$

$225\ mph$

$175\ mph$

$275\ mph$

$300\ mph$

Correct answer:

$225\ mph$

Explanation:

In general, $distance=rate\times time$ .

The distance is the same going and coming; however, the head wind affects the rate. The equation thus becomes $(r-25)\times 5=(r+25)\times 4$ .

Solving for $r$ gives $r=225\ mph$ .

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ACT Math : How to find the solution to an equation

Study concepts, example questions & explanations for ACT Math

All ACT Math Resources

Example Questions

Example Question #31 : How To Find The Solution To An Equation

Example Question #31 : How To Find The Solution To An Equation

Example Question #1801 : Act Math

Example Question #1802 : Act Math

Example Question #32 : How To Find The Solution To An Equation

Example Question #33 : How To Find The Solution To An Equation

Example Question #1805 : Act Math

Example Question #31 : Algebra

Example Question #33 : Algebra

Example Question #34 : How To Find The Solution To An Equation

All ACT Math Resources

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