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Ksju [112]
3 years ago
11

7x-6y=-1 5x-4y=1solving for eliminatio

Mathematics
2 answers:
Verdich [7]3 years ago
8 0
7x-6y=-1 \ \ \ |\times (-2) \\
5x-4y=1 \ \ \ |\times 3 \\ \\
-14x+12y=2 \\
\underline{15x-12y=3 \ \ \ } \\
15x-14x=2+3 \\
x=5 \\ \\
5x-4y=1 \\
5 \times 5-4y=1 \\
25-4y=1 \\
-4y=1-25 \\
-4y=-24 \\
y=\frac{-24}{-4} \\
y=6 \\ \\
\boxed{(x,y)=(5,6)}
Salsk061 [2.6K]3 years ago
5 0
<span>multiply the first equation by 5 and 2nd by -7 and you get 

35x-30y=-5 
-35x+28y=-7 

now you can cancel out the x's and you get 

-2y=-12 

so 

y=6 

now you can just plug y=6 into one of the original equations and you will see that x turns out to be 5

Hope thats okay</span>
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