Question

Use addition or substitution to find the value of x for this set of equations. 2x - 3y = -15
x = 4y

Answer 1

Multiply eq(2) by 2 and subract them :)

Answer 2

@Corinne202


Got it ?

Answer 3

Do I multiply both equations by 2?

Answer 4

nope only the second.:)

Answer 5

Only the second :)

Answer 6

How do I find out what x is doing that

Answer 7

2x - 3y = -15---(1)
x = 4y------(2)



1)Multiply (2) by 2
2)Subract (1) with (2)

Answer 8

@Corinne202

Is that understood ?

Answer 9

Yeah :)

Answer 10

Good to hear :)

Answer 11

What did you get ?

Answer 12

When I subtracted them I got y=3 then I put that in the first equation to find x= -12, is that correct?

Answer 13

y will be -3 ?

Answer 14

2x - 3y = -15---(1)
2x-8y = 0------(2)
- +
----------------
5y=-15

y=-15/5

y=-3


Now put this value in one of the equations and find x :)

Answer 15

@Corinne202

Understood ?