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Austin Crosby
Mathematics
14 May, 06:59
Solve 15x+3y=9,10x+7y=-4
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Mcbride
14 May, 07:28
0
x = 1, y = - 2
Step-by-step explanation:
15x + 3y = 9 (1)
10x + 7y = - 4 (2)
3 * (2) - 2 * (1)
3 * (2)
30x + 21y = - 12 (3)
2 * (1)
30x + 6y = 18 (4)
(3) - (4)
15y = - 30
y = - 30 / 15
y = - 2
sub y = - 2 into (1)
15x + 3y = 9
15x + (3 * - 2) = 9
15x - 6 = 9
15x = 9 + 6
15x = 15
x = 15 / 15
x = 1
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