Question

Help on this question? I'll fan and medal. :)

What is the solution of the system?

2x-y=-7
4x-y=-4

*(-1.5,4)
*(1.5,10)
*(4,-1.5)
*(-1.5,-2)

I'm confused because I keep getting (3/2,10) and thats not an answer choice. Can someone explain what I'm doing wrong?

Answer 1

Rearrange the terms for either equation... Let's say the second equation.

-y = -4x - 4

Substitute that for the first equation and solve for x...

2x - 4x - 4 = -7
-2x - 4 = -7
-2x = -3
x = 3/2

Finally...

2(3/2) - y = -7
3 - y = -7
-y = -10
y = 10

Hence, the solution is (3/2, 10) in terms of (x,y)

Answer 2

your right

Answer 3

Oh wow, it's just in decimal form on the answers! Haha I feel dumb, thankyou :)

Answer 4

welcame

Answer 5

welcome