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Kailyn Vaughan
Mathematics
2 May, 16:06
How do u do 2x-y=17
X-y=10
+3
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Isai Welch
2 May, 16:11
0
Multiply (x-y=10) by - 2. You will get - 2x+2y=-20. then multiply by 1 2x-y=17 that give u the same thing. Cross out the - 2x and 2x then subtract 2y by y which will leave u with y and subtract - 20 by 17 that will leave with - 3. So y = - 3
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Luciano Padilla
2 May, 16:27
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Another way to do it is
2x-y=17
x-y=10, x=10+y
substitute x=10+y for x in 2x-y=17 and get
2 (10+y) - y=17
20+2y-y=17
20+y=17
subtract 20 from both sides
y=-3
subsitute y=-3 into equation x-y=10
x - (-3) = 10
x+3=10
subtract 3 from both sides
x=7
or subsitute into 2x-y=17
2x - (-3) = 17
2x+3=17
subtract 3 from both sides
2x=14
divide both sides by two
x=7
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