Write an equation for the situation then solve for x. After paying $7 for a sandwich, John has $11. With how much money did he start? (I know the answer to the question but the steps on how to solve for x confuse me)

x = 18

Step-by-step explanation:

total money = money spent + money left

x = 7+11

x = 18

hello from mrbilldoesmath!

answer:

the domain is the set { -2, 0, 2, 3}

discussion:

the domain is the set of x values in the ordered pairs (x,y). taking the x, or first component, of each ordered pair gives   -2, 0, 2, 3.

you,

mrb

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.