All ACT Math Resources
Example Questions
Example Question #121 : Equations / Inequalities
When , by how much does the value of exceed the value of ?
You must plug in for and for , this means and
Example Question #122 : How To Find The Solution To An Equation
What is the value of when ?
The first step is to subtract from both sides so you're left with . Next, you add to both sides, giving you . The final step is to divide by , giving you .
Example Question #123 : How To Find The Solution To An Equation
Karen has more than times as many dollars as Susan. Karen also has as many dollars as John would if he had more dollars. How many dollars does Susan have, relative to John?
First, set up our two equations. If Karen has seven dollars more than three times as many dollars as Susan, then . If Karen has half as many dollars as John would if he had two more dollars, then . The Substitution Property of Equality thus says that . Now, we simply solve for in terms of .
Example Question #121 : How To Find The Solution To An Equation
If the third day of the year is a Wednesday, what is the 165th day?
Friday
Thursday
Tuesday
Wednesday
Monday
Thursday
If the third day is a Wednesday, then the first day is a Monday. 23 weeks will complete a cycle with the 161st day. Therefore, the fourth day past that, 165, is a Thursday.
Example Question #1 : How To Find The Solution To A Rational Equation With Lcd
John, Jill, and Jack are splitting a pizza. John eats of the pizza and Jill eats of the pizza. How much of the pizza is left for Jack?
We can write an equation for the amount of pizza eaten, with as the amount left for Jack.
To solve this equation, we must find the lowest common denominator of and . We can list the multiples of and to find the least common multiple:
We can see that the least common multiple of and is , so we can rewrite each of the fractions with a denominator of .
When we put these fractions back into the equation, we can solve for :
Example Question #2 : How To Find The Solution To A Rational Equation With Lcd
What is the slope of a line represented by the equation:
To solve problems where you need to find the slope of a line in a given equation, change the equation so that it matches y-intercept form:
For this equation, first move the 3x over to the other side of the equation.
The equation should now look like this:
Then, divide by 15 to isolate the variable .
Then simplify
Whatever number is before the x in the equation (m) is your slope.
Example Question #401 : Algebra
1
2
0
–2
–1
2
Example Question #402 : Algebra
–b/(m2 – 1)
–bm/(m2 + 1)
b/(m2 + 1)
bm/(m2 + 1)
–b/(m + 1)
b/(m2 + 1)
Example Question #401 : Algebra
In the equation below, , , and are non-zero numbers. What is the value of in terms of and ?
Example Question #1901 : Act Math
Given the following system, find the solution:
x = y – 2
2x – 2y = 2
(1, 2)
(0, 1)
no solution
(1, 1)
(0, 0)
no solution
When 2 equations in a system have the same slopes, they will either have no solution or infinite solutions. Since the y-intercepts are not the same, there is no solution to this system.
Certified Tutor
Certified Tutor