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vaieri [72.5K]
3 years ago
8

Need help pls solve 7x-4y=-7 5x+y=22

Mathematics
2 answers:
Vinil7 [7]3 years ago
8 0
I think this would be the correct answer <span>{x,y} = {3,7}</span><span> </span><span />
aev [14]3 years ago
3 0
<span>7x-4y=-7
5x+y=22

multiply 4 on the 2nd equation
</span>20x+ 4y=88

now you have
7x -4y = -7 
20x + 4y = 88
--------------------add
27x = 81
x = 3

7x-4y=-7
7(3)-4y=-7
-4y = -28
y = 7

answer (3, 7) is the solution
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