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Mathematics 11 Online
OpenStudy (anonymous):

4x+5y=51 4x-5y=21

mathslover (mathslover):

Best will be to solve it with : Elimination method. \(\mathsf{4x + 5y = 51\\ 4x - 5y = 21}\) + (Adding both equations ) ----------------- \(\mathsf{8x + 0 = 72}\) \(\mathsf{\implies 8x = 72 \implies x = ? }\) Solve for x from 8x = 72

mathslover (mathslover):

Put the value of x in any of the equation and solve for y.

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