Question 1190677
Same problem, different numbers.
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2x+y=5
2y=2x-8 ---> y = x-4
Find the first variable (that you want to use) and isolate it then solve for it
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y is isolated and solved for in terms of x.
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2x+y=5
Sub for y
2x + (x-4) = 5
3x - 4 = 5
3x = 9
x = 3
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y = x-4
y = -1
That's solved by substitution.
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Another way is elimination:
2x+y=5
2y=2x-8
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2x +y = 5
2x-2y = 8
-------------- Subtract
3y = -3
y = -1
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2x +y = 5
2x - 1 = 5
2x = 6
x = 3