15-5x+10x+12 simplified

5x+27

Work Shown:

15 and 12 are one pair of like terms that add to 15+12 = 27

The other pair of like terms are -5x and 10x which combine to -5x+10x = 5x

you can think of it as 10x-5x = 5x, or another way is

10x = 10 boxes

5x = 5x boxes

10x-5x = start with 10 boxes, take away 5 boxes ---> 5 boxes left over

after combining the like terms, you'll end up with 5x+27

step-by-step explanation:

step 1: solve one of the equations for one of the variables. let's solve the first equation for y:

step 2: substitute that equation into the other equation, and solve for x.

step 3: substitute x = 4 x = 4 x=4 into one of the original equations, and solve for y.