Question

What is the best first step to solve the system using elimination?

x - 5y = 4
3x + 7y = -17

Answer 1

Any ideas?

Answer 2

Nope, I have no idea how to do this

Answer 3

What is the plan of attack with using "elimination"?

Answer 4

Identify and create opposite coefficients

Answer 5

yes

Answer 6

Yep, so look for opposites first.

Answer 7

multiply fist equation by 3 and then substract them

Answer 8

If you can't find any multiply both sides of the equation to "create" them.

Answer 9

-3(x-5y=4) *multiply the top equation by -3 so the x values will be opposites
3x+7y=-17

-3x+15y=-12
3x+ 7y=-17 *then simply add the top equation to the bottom one

22y=-29
y=\[-\frac{ 29 }{ 22 }\]