Question

I need help, I am so confused. I wish I understood these things better.
solve the system by substitution

-4.5x - 2y = -12.5
3.25x - y = -0.75

Answer 1

Notice how the second equation has -y. The easiest thing would be to rearrange the second equation so that y is by itself on the left side

Answer 2

so i would subtract 3.25x to each side right?

Answer 3

yes

Answer 4

A good plan,

Answer 5

so it would be -y = -0.75 - 3.25x ??

Answer 6

Perfect. now get rid of the negative

Answer 7

on the left side

Answer 8

so where would I go from here, I am so bad at solving these I'm sorry

Answer 9

divide both sides by -1

Answer 10

where did -1 come from?

Answer 11

-y is basically just (-1)y

Answer 12

OH yeah

Answer 13

y = .75 - 3.25x

Answer 14

almost.
y = 0.75 + 3.25x

Now plug that into the first equation for y

Answer 15

and solve for x

Answer 16

That's the substitution part

Answer 17

-4.5 (3.25) - 2 (.75) = -12.5

Answer 18

i dont think i arranged that correctly

Answer 19

Not quite.
-4.5x -2(0.75 + 3.25) = -12.5

Answer 20

sorry 3.25x I meant

Answer 21

-4.5 -2(0.75 + 3.25x) = -12.5

solve for x

Answer 22

i've been trying to figure that out and i can't get it, do i multiply??

Answer 23

Remove the parentheses getting -4.5 - 1.5 - 6.5x = -12.5 Now i bet you can solve for x.

Answer 24

Add a +6 to both sides getting -6.5x = 6.5 Now divide both sides by a -6.5 so that we have a positive x on the left or: x = -1 Now your work is not over you still have to solve for y. Substitute the -1 for x in the second original equation: 3.25x - y = -0.75 and solve for y.