Select the equivalent expression. −4(2a−3)+5a 1. 3(a+4)
2. −3(a−4)
3. −3(a+4)
4. 3(a−4)

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.