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Fifi
Mathematics
15 February, 21:48
7x - 5y = 22
7x - 9y = 6
What's y?
+2
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Maddox Cochran
15 February, 21:50
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
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Finn Price
15 February, 22:18
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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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