method of substitution

1.
y=3x+5----(1)
2x-y=-3----(2)

sub (1) into (2): 2x-(3x+5)=-3
2x-3x-5=-3
-x-5=-3
-x=2
x=-2
sub x=-2 into (1): y=3(-2)+5
y=-6+5
y=-1

ans: x=-2, y=-1


2.
4x+5y=1---(1)
2x-y+3=0---(2)

(2):2x+3=y
y=2x+3----(3)
sub (3) into (1): 4x+5(2x+3)=1
4x+10x+15=1
14x=-14
x=-1
sub x=-1 into (3): y=2(-1)+3
y=-2+3
y=1

ans: x=-1,y=1