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cg2929

If x+y=4 then Y=4-x so 4x +3(4-x)=13 is 4x + 12 - 3x = 13 then add your x's together and you get 1x then subtract 12 from each side and you are left with 1x=1 so x=1 then plug 1 in for x in the original formula and you get 4(1) +3y =13 you then subtract 4 from each side and get 3y = 9 divide each side by 3 and you get y=3

syed514

For substitution, you need to solve one equation in terms of the other.
The easiest one would be the second one. So subtract over the x giving:
y=4-x. From here you SUBSTITUTE it into the other one.
4x+3(4-x)=13
Distribute:
4x+12-3x=13
combine.
x+12=13.
Subtract
x=1. From there, take that and substitute that into what you solved y.
y=4-1=3. :)

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