3 years ago

7x - 5y = 22 7x - 9y = 6 What's y?

2 answers:

8 0

So you need to first cancel out x so multiply -1 to one of the equations i'm gong to pick the second one so now it is 7x-5y=22 and -7x+9y=-6 then add so 4y=16 so y=4

Vesna [10]3 years ago

3 0

You can do this by taking away the second equation from the first to get rid of the x terms so:

7x - 7x = 0
-5y - -9y = - 5y + 9y = 4y
22-6 = 16

So you are left with the equation:
4y = 16

Divide both sides by 4 to find y
y = 4

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