A drummer is stocking up on drumsticks and brushes. The drumsticks that he buys are $10.50 a set and the brushes are $24 a set. He buys twice as many sets of sticks as brushes. If he spent $90 on drumsticks and brushes, how many sets of sticks and brushes did he buy?

4 packs of sticks

2 packs of brushes

Step-by-step explanation:

I estimated to start and then proved it by

10.50 x 4 equaling 42

24 x 2 equaling 48

Add them to get 90.

Mark me as brainliest if this helps!

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step-by-step explanation:

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18