2y+x=-15
x=3y
2y+(3x)=-15
2y + (3*3y) = -15
11y=-15
y = -15/11

4x+7y=19
y=x+9
4x+7(x+9)=19
4x + 7x + 63 = 19
11x = -44
x = -4

y=6x+11
2y-4x+14
2(6x+11)-4x+14

2x-8y=6
y=-7-x
2x-8(-7-x)=6

x=2y-1
3x-2y=-3
3(2y-1)-2y=-3

what do x and y equal in each of these

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.

Axel follows these steps to divide 40 by 9: start with 40. 1. divide by 9 and write down the remainder. 2. write a zero after the remainder. 3. repeat steps 1 and 2 until you have a remainder of zero. examine his work, and then complete the statements below.