payshencec21
payshencec21
16-03-2018
Mathematics
contestada
brainlest for BEST answer
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Kaikerscupcake
Kaikerscupcake
16-03-2018
Hey there! :D
Add the expression's together.
3x+y=27
-3x+4y= -42
3x+(-3x)= 0
y+4y=5y
27+(-42)= -15
5y=-15
Divide both sides by 5.
y=-3
Now, find x.
3x+y=27
3x-3= 27
3x=30
x=10
The solution is (10,-3).
I hope this helps!
~kaikers
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ampomahn82
ampomahn82
16-03-2018
3x + y = 27
-3x + 4y = -42
5y = -15
y = -3
3x + (-3) = 27
3x = 30
x = 10
answer is D
Answer Link
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