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Rzqust [24]
3 years ago
10

Solve using substitution. x + 2y = 14 -5x + y = 18

Mathematics
2 answers:
LiRa [457]3 years ago
6 0
x+2y=14\\
-5x+y=18\\

y=18+5x\\

x+2(18+5x)=14\\
x+36+10x=14\\
11x=14-36\\
11x=-22\\
x=-2\\

-5(-2)+y=18\\
10+y=18\\
y=8
Tatiana [17]3 years ago
5 0
X + 2y = 14
-5x + y = 18 --> y = 5x +18
x + 2(5x+18)  = 14
x + 10x +36 = 14
11x + 36 = 14
11x = -22
x = -2
sub x = -2 back in one of first two equations:
x + 2y = 14
-2 + 2y = 14
2y = 16
y = 8

x = -2, y = 8
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