5) x - 4y = 28
-4x - y = 7
Solve each system by elimination
2 answers:
Answer:
(0,-7)
Step-by-step explanation:
x-4y=28 multiply by 4
-4x-y=7 multiply by 1
4x-16y=112
-4x-y=7
cross out the x and add the rest
-17y= 119
divide by -17
y= -7
now you substitute the y in one of the equations.
the reformed equations
we will use the second one
-4x-(-7)=7
two negative becomes a plus
-4x+7=7
now you minus the 7 to both sides
-4x=0
now divide by -4
x=0
(0,-7)
Answer:
x = 0, y = -7
Step-by-step explanation:
x - 4y = 28
-4x - y = 7
____________
x - 4y = 28
-16x - 4y = 28
____________ _
17x = 0
x = 0
0 - 4y = 28
y = -7
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