How do you use the substitution method to solve y=6x+5,6x−y=7?
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y=6x+5
6x-y=-5 -> eq.1
6x-y=7 ->eq. 2
on subtracting eq. 1 from eq. 2
6x-y=7
-6x-y=-5
(+) (+)
y is cancell
x = 12
on substituting x= 12 in eq. 1
6x-y=-5
6×12-y=-5
72-y=-5
-y=-5-72
-y= -78
- cancel
y= 78
Answer: x= 12
y =78
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Step-by-step explanation:
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