Question

4x+3y=13 solve by using substitution method. y=-x/4

Answer 1

Subsitute -x/4 for y

4x+3y=13
4x+3(-x/4)=13
4x-3x/4=13
times both sides by 4 because we hate fractions
16x-3x=52
13x=52
divide both sides by 13
x=4

sub back
y=-x/4
y=-4/4
y=-1

(x,y)
(4,-1)


the solution is (4,-1)