Question

The sum of two numbers is 15 and there difference is 7

Answer 1

$\huge \bf \underline \purple{❥} \underline \red{A} \underline \orange{n} \underline \pink{s} \underline \green{w} \underline \blue{e} \underline \orange{r} \red{:↦}$

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❏Let the numbers be x and y

X + Y =15 -----------1st Equation

X -Y = 7 ------------ 2nd Equation

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❏Make X subject of formula in equation 1

X = 15-Y --------------- 3rd Equation

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❏Substitute for X in equation 2

15 -Y -Y = 7

15 - 2Y = 7

15 - 7 = 2Y

8 = 2Y

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❏Divide both sides by 2

Y = 4

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❏Substitute for Y in equation 3

X = 15 - Y

X = 15 - 4

X = 11

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❏Therefore the numbers are ㅤ11 and 4

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