Question

Solve the following system of equations. Express your answer as an ordered pair in the format (a,b), with no spaces between the numbers or symbols.
2x+7y=-1
4x-3y=-19

Answer 1

2x + 7y = -1......(- 2)
4x - 3y = - 19
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- 4x - 14y = 2
4x - 3y = - 19
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- 17y = - 17
y = 1

2x + 7y = - 1
2x + 7(1) = - 1
2x + 7 = - 1
2x = - 8
x = - 4

(- 4, 1)

Answer 2

any questions ?

Answer 3

hold on.. how you got (-2)?

Answer 4

basically, I multiplied 1st eq by - 2....then adding the equations, thus, eliminating the x's and solving for y. Once I found y, I subbed that back into an original equation to find x.

Answer 5

understand ?

Answer 6

this is elimination method...in this case, easier then substitution...so we r not stuck dealing with fractions.

Answer 7

alright, and thank you for your help

Answer 8

yw