Solve by substitution method

Question

2x 5y=32

x=68-9y

Answer 1

I'm assuming that the two equations are:

2x + 5y = 32

x = 68 - 9y

Substitute the expression '68 - 9y' from the second equation in place of 'x' in the first equation:

2(68 - 9y) + 5y = 32

Multiply it out:

136 - 18y + 5y = 32

Combine terms and subtract 136 from both sides:

-13y = 32 - 136

-13y = -104

Divide by -13:

y = 8

Plug the value 8 into equation 2 in place of 'y':

x = 68 - (9 * 8)

x = 68 - 72

x = -4

The solution is x = -4 and y = 8.

Answer 2

2x+5y=32

x=68-9y

substitute x into 2x+5y=32

2(68-9y)+5y=32

136-18y+5y=32

136 -13y=32

-136       -136

-13y=-104

y = 8

Answer 3

Hi,

is it a correct equation ?

do you mean 2x + 5y = 32 ?