Question

What is y = -3x+4 and y=-7x

Answer 1

x=-1 , y=7

Explanation:

y = -3x+4 and y=-7x

substitute y=-7x in the equation y = -3x+4

-7x=-3x+4 ( put variable(x) together)

-7x+3x=4

-4x=4

x=-4/4

x=-1

find y: y=-7x ⇒ y=-7(-1) ⇒ y=7

check :y = -3x+4

7=-3(-1)+4

7=7 ( correct)

Answer 2

Answer: (-1,7)

I assume you are asking for the solution to this system. Using substitution, -7x=-3x+4 -> -4x=4 -> x=-1. y=-7(-1)= 7.