solve the question by elimination ( by substitution)
5x-2y =19
3x+y=18
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By elimination method
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Answer:
5x - 2y = 19
x = ( 19 + 2y ) / 5
3x + y = 18
3( 19 + 2y ) / 5 + y = 18
57 / 5 + 6y / 5 + 5y / 5 = 18
11y / 5 = 18 - 57 / 5
11y / 5 = ( 90 - 57 ) / 5
y = 33 / 5 × 5 / 11
y = 3
x = ( 19 + 2y ) / 5
= [ 19 + 2(3) ] / 5
= 25 / 5 or 5
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