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Mathematics
Nylah Wolfe
31 December, 10:08
X+7=2y+1
3x-y=7
solve for x and y
+2
Answers (
1
)
Dane Dunn
31 December, 12:34
0
{x+7=2y+1 ⇔ x-2y=1-7 ⇔ x-2y=-6
{3x-y=7 / * (-2)
{x-2y=-6
{-6x+2y=-14 (+)
x-6x-2y+2y=-6-14
-5x=-20 / : (-5)
x=4
x - 2y=-6
4-2y=-6 / - 4
-2y=-10 / : (-2)
y=5
Solution: (4; 5)
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