Problem

{4x−y=8x+y=7

Answer

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Answer

x=3,y=4

Steps

Step 1 ：{4x−y=8x+y=7

Step 2 ：Solve for x in the second equation: x=7−y

Step 3 ：Substitute the expression for x into the first equation: 4(7−y)−y=8

Step 4 ：Solve for y: 28−5y=8

Step 5 ：y=4

Step 6 ：Substitute the value of y back into the expression for x: x=7−4

Step 7 ：x=3

Step 8 ：x=3,y=4

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