If you were to use the substitution method to solve the following system, choose the new equation after the expression equivalent to y from the first equation is substituted into the second equation.

15x - y = -6
5x - 3y = -13

Question

If you were to use the substitution method to solve the following system, choose the new equation after the expression equivalent to y from the first equation is substituted into the second equation.

15x - y = -6
5x - 3y = -13

anonymous · Answer

5(-15x - 6) - 3y = -13
	5(15x + 6) - 3y = -13
	5x - 3(15x + 6) = -13
	5x - 3(-15x - 6) = -13

blurbendy · Answer

in the first equation, you need y to equal something so you can substitute it into the second equation.  so, isolate y in the top equation

texaschic101 · Answer

-y = -6 - 15x (multiply by -1 to make y positive)
y = 15x + 6
now sub 15x + 6 in for y in the 2nd equation and what do you get ?