What is the answer to -5x+7y=11
-5x+3y=19
2 answers:
Take one equation away from the other. This cancels out the -5x, so you can work out y.
-5x+7y=11 -
-5x+3y=19
---------------
4y=-8
y=-2
Then add the y into one of the equations, and solve.
-5x-6=19
-5x=25
x=-5
To check, add both x and y into the other equation.
25-14=11
That is correct, so we know that our working is correct.
x=-5
y=-2
:)
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