Question

Solve the system of equations. 4x - 4y = 10 3x + 2y = 5

ANSWER CHOICES
(2, -1/2)
(1, 1)
(3, -2)
(3,1/2 )

Answer 1

A) (2, -1/2)

Explanation:

Start with one equation and isolate a variable:

4x - 4y = 10

4x - 4x - 4y = 10 - 4x

-4y = 10 - 4x

-4y/-4 = 10/-4 - 4x/-4

y = -2 1/2 + x

Now plug this in for y in the other equation:

3x + 2(-2 1/2 + x) = 5

3x - 5 + 2x = 5

5x - 5 = 5

5x - 5 + 5 = 5 + 5

5x = 10

5x/5 = 10/5

x = 2

Right here we can tell your answer is A since it is the only one with 2 as the x-value