Question

how to solve these simultaneous equations
2x + y = 12

y = 2x + 2

Answer 1

Answer:

1 Answer

Make y the subject in one equation: 2x+y=12 => y=12−2x.

Substitute into the second equation and solve for x : x+y=7 => x+12−2x=7 => x=5.

Use this value to solve for y : x+y=7 => 5+y=7 => y=2.

Answer 2

Answer:

Make

y

the subject in one equation:

2x+y=12=> y=12−2x

Substitute into the second equation and solve for

x:x+y=7=> x+12−2x=7=> x=5

Use this value to solve for

y :x+y=7=> 5+y=7=> y=2