you have to solve for the variable for example. 4x + 2y = 8. you would solve for y. so you subtract the 4x and you do the same to both sides and you get 2y = -4x + 8. you then divide everything by 2 to get y by itself and you end up with y = -2x + 4
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the figures are similar. Find the value of each variable. solve
Take the value of each variable in the expression and replace the variable by its value. Then do the math!
By eliminating or substituting one of the variables in the two equations in order to find the value of the other variable. When this variable is found then substitute its value into the original equations in order to find the value of the other variable.
Cross multiply then solve for the variable.
Solving for one variable makes it easy to put in a value for the other variables, and find a value for the first variable.