Question 851107
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The equations are {{{7*x - y = -1}}} (1)
{{{y = 5*x + 3}}} (2)

Substituting for y from eqn (2) into eqn (1)


{{{7*x - (5*x + 3) = -1}}}
i.e. {{{7*x - 5*x - 3 = -1}}}
i.e. {{{2*x = 2}}} or {{{x = 1}}}
Therefore, {{{y = 5*x + 3 = 8}}}

Check: (1) {{{7*x -y = 7*1 - 8 = -1}}}
(2) {{{8 = 5*1 + 3}}} Correct!

Solution: {{{x = 1}}} and {{{y = 8}}}

Hope this helps!

Cheers, Ramki.
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