31 32 33 34 35 36 37 38 39 40 Sophia’s math test is worth 130 points and has 40 problems. Each problem is worth either 4 points or 3 points. How many of each question type were on the test?
The test had 30 4-point questions and 10 3-point questions.
The test had 10 4-point questions and 30 3-point questions.
The test had 28 4-point questions and 12 3-point questions.
The test had 25 4-point questions and 10 3-point questions.

The correct answer is: The test had 10 4-point questions and 30 3-point questions.

Step-by-step explanation:

Let t be the number of 3-point questions on the test

and

f be the number of 4-point questions on the test

Then,

According to the given statement that the test had 40 problems

 Eqn 1

And

According to given statement that the total points are 130

 Eqn 2

These equations form a system of linear equations in two variables.

Elimination method or substitution method can be used to solve the system.

So, from equation 1:

Putting t = 40-f in equation 2

Subtracting 120 from both sides

Putting f = 10 in equation 1

Subtracting 10 from both sides

Hence,

Number of 3-point questions = t = 30

Number of 4-point questions = f = 10

So,

The correct answer is: The test had 10 4-point questions and 30 3-point questions.

e

step-by-step explanation:

an equation by definition has to have two or more variables (x and 2 in this case)