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Secondary 1 | Maths
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Please!
See that -y there? Make it the same as the -3y in the other equation.
Multiply by 3,
6x - 3y = 9
We know that 7x - 3y = 13
So 7x - 3y - (6x - 3y) = 13 - 9
Notice the 3y cancels out. And 7x - 6x = x
So you're left with x = 4
Now, substitute x = 4 back into any of the equations to solve for y
Eg. 2x - y = 3
So y = 2x - 3
y = 2(4) - 3 = 5
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