Question

Solve by the substitution method.
2x+9y=20
x=8-4y

What is the solution of the system, if there is one?

A. The solution is ____.
B. There is no solution.

Answer 1

y=-36 and x=-136

Answer 2

sub x=8-4y into the top equation,

2(8-4y) + 9y =20
16- 8y + 9y =20
y=20-16
y=4

sub y =4 into the 2nd equation,
x =8-4(4)
x=-8

Therefore, the solution for the system is x =-8, y=4

Answer 3

Sorry for wrong answer.I didn't notice the sign!!!