Math, asked by shizakausar25, 1 year ago

Using substitution method 27x+31y=8531x+27y=89

Answers

Answered by hukam0685
2
step 1) add both equations
step 2) subtract both equation
27x + 31x + 31y + 27y = 85 + 89 \\ 58x + 58y =174 \\ x + y = 3 \:  \:  \:  \:  \: eq1 \\ (27 - 31)x + (31 - 27)y = 85 - 89 \\  - 4x + 4y =  - 4 \\  - x + y =  - 1   \:  \:  \:  \: eq2 \\ add \: both \: eqs \\ 2y = 2 \\ y = 1 \\ x + 1 = 3 \\ x = 2
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