Question

SOLVE BY SUBSTITUTION METHOD:
x + y = 7 , 5x + 12y = 7

Answer 1

x+y = 7 ......(1)
x= 7-y .
5x+12y = 7 .....(2)
putting value of x in equation 2.
5×(7-y) + 12y = 7 .
35- 5y +12y = 7 .
7y = -28.
y= -4 .
putting value of y in equation 1 we get
x+y=7 .
x+(-4) =7
x= 7+4 = 11.
Hope this answer will help you and plz mark it as brainliest.

Answer 2

Here is your answer :

x + y = 7 -------- equation 1)

5x + 12 y = 7 ---------- equation 2)

x = 7 - y --------- equation 3)

substitute x = 7 - y in equation 2)

5 ( 7 - y ) + 12y = 7

35 - 5y + 12y = 7

7y = 7 - 35

7y = -28

y = -28 / 7

y = -4

Substitute y = -4 in equation 1)

x + ( - 4 ) = 7

x - 4 = 7

x = 7 + 4

x = 11


So x = 11 and y = -4

Hope it helps.

Have a good day .