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2 votes
What would you multiply to make the y variable cross out?

-5x + y = -3

3x - 8y = 24

User Zdim
by
8.5k points

2 Answers

10 votes

Answer:

I will show you how to solve for x and y.

Explanation:

-5x + y = -3

3x - 8y = 24

You can isolate y in the first equation, and substitute that into the second equation.

so to isolate y in -5x + y = -3, you would add 5x to both sides

this gives you y = 5x - 3

Then substitute this y into the equation below.

3x - 8(5x-3) = 24 (this way, the y variable disappears)

then distribute the 8 into the bracket

3x - 40x + 24 = 24

combine the variables

-37x + 24 = 24

isolate x by moving the constants to one side

-37x = 0

so x = 0

I am not sure if you want the rest, but here it is.

substitute x = 0 into one of the equations.

-5x + y = -3

-5(0) + y = -3

y = -3

User Jumpjack
by
7.8k points
10 votes

Answer:

Explanation:

-40x + 8y = -24

3x - 8y = 24

-37x = 0

x = 0

0 + y = -3

y = -3

(0, -3)

User Muggin
by
8.0k points

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