Solve: We'll use substitution. After moving 1*y to the right, we get: , or . Substitute that
into another equation: and simplify: So, we know that y=-6. Since , x=-3.
Answer: .
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website! help soving each system of linear equations bysubstitution
-4x+y=6
-5x-y=21
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Modify::
y = 4x+6
y = -5x-21
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Substitute to get:
4x+6 = -5x-21
9x = -27
x = -3
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Solve for "y"::
y = 4(-3)+6
y = -6
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Cheers,
Stan H.
--------------- Answer by macston(5194) (Show Source): You can put this solution on YOUR website! Solve second equation for x
-5x=y+21
x=(y+21)/-5 Substitute for x in first equation.
-4((y+21)/-5)+y=6
.8y+16.8+y=6 Subtract 16.8 from each side.
1.8y=-10.8 Divide each side by 1.8.
y=-6 ANSWER 1: y=-6 Substitute for y in first equation.
-4x+y=6
-4x-6=6
-4x=12
x=-3 ANSWER 2: x=-3
CHECK:
-5x-y=21
-5(-3)-(-6)=21
15-(-6)=21
21=21