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ivolga24 [154]
4 years ago
15

What is -4x+y=6 and -5x-y=21 in subsitution

Mathematics
1 answer:
kifflom [539]4 years ago
8 0
Solve for y in the first equation.
y = 4x + 6
Substitute <span>4x + 6 into the second equation.
-5x - (</span><span>4x + 6) = 21
Distribute
-5x - 4x - 6 = 21
Combine like terms 
-9x = 27
Divide both sides by -9
x = -3
Substitute back into first equation
-4(-3) + y = 6
Solve for y
y = -6</span>
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