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Vsevolod [243]
4 years ago
13

HELP ME DO THIS y=2x+4 -5x-5y=-5

Mathematics
2 answers:
meriva4 years ago
7 0
Y=2x+4
-5x-5y=-5
subsitute 2x+4 for y
-5x-5(2x+4)=-5
-5x-10x-20=-5
-15x-20=-5
add 20 to both sdies
-15x=15
divide by -15
x=-1

subsitute
y=2(-1)+4
y=-2+4
y=2


x=-1
y=2
Helen [10]4 years ago
3 0
\left \{ {{y=2x+4} \atop {-5x-5y=-5}} \right. \\\\ substitute\ first\ equation\ into \ the\ second\\\\
-5x-5(2x+4)=-5\\\\
-5x-10x-20=-5\\\\
-15x-20=-5\ \ \ | add\ 20\\\\
-15x=15\ \ \ | divide\ by\ -15\\\\
x=-1\\\\
y=2*(-1)+4=-2+4=2
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