9x – 4y = 43
2x + 12y = 79

solve by substitution with work and explanation pleasee. WILL FAVORITE AND AWARD MEDAL

Question

9x – 4y = 43
2x + 12y = 79

solve by substitution with work and explanation pleasee. WILL FAVORITE AND AWARD MEDAL

qwert2 · Answer

First you want to rework one of the two equations so that you can solve for x
Next plug in the new equation into the equation that you did not rework. For example, say that x=3y. That would mean you plug 3y into where x would be in the equation. After you've done that, you should have y. Plug in that number into one of the equations to get x. Does that make sense?

hansolo321 · Answer

@qwert2 this is one question from my homework. can you work it out for me so i can use it as example

qwert2 · Answer

Ok I'll try. The first step would be to solve 2x+12y=79 for x. |dw:1473369262381:dw|
once you got that, plug in -6y+39.5 into 9x-4y=43 like this:
9(-6y+39.5) -4y=43. Solve for y.