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Y=4x+3 y=-2x-9 solve for substitution
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4 votes
Y=4x+3
y=-2x-9
solve for substitution

User AngelaG
by
7.4k points

1 Answer

4 votes
To solve this, we multiply the second equation by -2:
y = 4x+ 3
-2y = 4x + 18
Subtract:
y = 4x + 3
-(-2y = 4x + 18)
3y = 15
y = 5
Input this:
5 = 4x + 3
4x = 2
x = 1/2
(1/2, 5)
User Kracejic
by
7.4k points
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