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substitution for 4x+y=9 and y=-7

Sagot :

eu99li


{y=-7

{4x+y=9            Substitute y.


4x+(-7)=9

4x-7=9        /+7

4x=16     /:4

x=4

Solution; (4; -7)

iGreen
4x + y = 9

y = -7

Plug it in:

4x - 7 = 9

Add 7 to both sides:

4x = 16

Divide 4 to both sides:

x = 4

Plug this back into the equation:

4x + y = 9

4(4) + y = 9

16 + y = 9

Subtract 16 to both sides:

y = -7

So our solution is (4, -7)
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