Question

Find the solution of the system of equations.

-4x + y = 23
4x - 9y = -15

Answer 1

Answer: (x, y) = (-6, -1)

Explanation:

equation 1 for the variable y

• y = 4x + 23

variable y in equation 2

4x - 9•(4x+23) = -15-32x = 192

Solve equation 2 for the variable x

• 32x = - 192
• x = - 6

now we know:

x = -6

y = 4x+23

x value to solve for y

y = 4(-6)+23 = -1