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Solving systems by substitution y=-4x-7 -4x-y=7​
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12 votes
Solving systems by substitution
y=-4x-7
-4x-y=7​

User Helenesh
by
3.5k points

1 Answer

8 votes
the variable y is given.
now, substitute y in the second equation to get
-4x - (-4x-7) = 7
then we solve

first distribute
-4x+4x+7=7
combine like terms
0+7 = 7
7 = 7

because the answer is true, the solution to this system is “all real numbers”
User Wayne Lo
by
3.8k points
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