y=-3x,y=2x+5

y=-3x

y=2x+5
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1 Answer

y=-3x,y=2x+5

Multiply y=-3x by 2:
2* y = (-3x) * 2
2y = -6x

Multiply y=2x+5 by 3:
3 * y = (2x + 5) * 3
3y = 6x + 15

Add the two resultant equations:
   2y = -6x
+(3y = 6x + 15)
-----------------------
 5y   =        15
y = 3

Using equation 1, we can get x:
y = -3x
3 = -3x
-1 = x

Use equation 2 to check your answer:
y = 2x + 5
3 = 2(-1) + 5
3 = -2 + 5
3 = 3

We have x = -1 and y = 3
by Level 11 User (78.4k points)

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