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Mathematics
Alden Curry
15 June, 08:05
3x plus y equals 17
4x - y equals 18
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Ward
15 June, 10:15
0
3x+y=17
4x-y=18
4x-y=18
subtract 18 from both sides
4x-y-18=0
add y to both sides
4x-18=y
subsitute 4x-18 for y in first equation
3x + (4x-18) = 17
7x-18=17
add 18 to both sides
7x=35
divide both sides by 7
x=5
subsitute
y=4x-18
y=4 (5) - 18
y=20-18
y=2
x=5
y=2
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