Question

I need help ASAP ! Nd plz help me how to show work

Answer 1

x = -3

Explanation:

y = -x + 2

7x + 4y = -1

Subsitution method: (Substitute y)

7x + 4(-x+2) = -1

Expand.

7x + (-4x + 8) = -1

One plus and one minus make one minus. Two plus makes a plus.

7x -4x + 8 = -1

Simplify.

3x + 8 = -1

Isolate 3x.

3x = -1-8

= -9

Find x.

x = -9 ÷ 3

= -3