Answer:
x=-2 and y=2
Step-by-step explanation:
Do simultaneous equations
-8x + 4y = 24 (multiply everything in the equation by -7)
-7x + 7y = 28 (multiply everything in the equation by 8)
56x - 28y = -168
-56x + 56y = 224
(add equations, ie add 'x' parts, 'y' parts, and numerical parts)
28y = 56
∴y = 2
-8x + 4y = 24
-8x + 4(2) = 24
-8x = 16
∴x=-2
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