Question

solve the following simultaneous equations: x + y = 42 ; X - 3y = -8​

Answer 1

Answer:

x=12.5, y=29.5

Step-by-step explanation:

x+y =42 ---A

x-3y=-8 ----B

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0+4y =50 ----A-B

y=12.5

x+12.5 = 42

x= 29.5

Answer 2

Answer:

x=29.5 y=12.5

Step-by-step explanation:

x+y=42

x=42–y. (i)

x–3y= –8. (ii)

putting the value of eq(i) in eq(ii)

x–3y = –8

42–y–3y = –8

42–4y = –8

–4y = –8 –42

–4y = –50

y = –50/–4

y = 12.5. (iii)

now, put the value of eq(iii) in eq(i)

x = 42–y

x = 42 –12.5

x = 29.5

I hope it helps you