Asked by crystine

i need help solving the problem
3x+y=-1
2x+3y=18
using substitution
Answered by Ms. Sue
3x+y=-1
y = -1 -3x

2x+3y=18
2x + 3(-1-3x) = 18
2x - 3 - 9x = 18
-7x = 21
x = -3

Substitute -3 for x in the first problem to find the value of y.

Answered by sukhi
matrix[2x,0
4,-y]=matrix[4,0
4,1]
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