b. $x + 7y = 69$ and $6x + 4y = 78$
Added by Alexander V.
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First, let's solve the second equation for x: 6x + 4y = 78 Subtract 4y from both sides: 6x = 78 - 4y Divide both sides by 6: x = (78 - 4y)/6 Now, substitute this value of x into the first equation: b(78 - 4y)/6 + Ty = 69 Multiply both sides by 6 to get rid of the Show more…
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