Question

If 2x + 5y = 21 and x + y = 3, then what is the value of x?

A) x = -5

B) x = -2

C) x = 2

D) x = 5

Answer 1

We will plug all the answers in. . First lets try -5

2(-5) + 5y = 21

-10 + 40 = -30

not that one

2(-2) + 5y = 21

-4 + 25 = 21

It is that one! The answer is b, -2

Explanation: