Question

7x+3y=-15, 12y-5x=39 substitution method
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Answer 1

Step-by-step explanation:

7x+3y= -15

x= -15 -3y/7 ------->3

substituting value of x in equation 2

12y -5(-15 -3y/7) =39

12y+75+15y/7=39

12y+75+15y=39×7

12y+15y=273 -75

12y+15y=198

27y=198

y=198/27

y=7.3 approx

so, y=7

substituting the value of y in eq 3

x= -15 -3(7)/7

x= -15 -3

therefore x= 18

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