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ra1l [238]
4 years ago
9

3x-4y=-5 5x+8y=-1 solve by elimination please

Mathematics
1 answer:
katovenus [111]4 years ago
7 0
Eliminate y's
double the first equaiton
we get 6x-8y=-10
add to 2nd equation


6x-8y=-10
<u>5x+8y=-1 +</u>
11x+0y=-11

11x=-11
divide both sides by 11
x=-1
sub back


3x-4y=-5
3(-1)-4y=-5
-3-4y=-5
add 3 both sides
-4y=-8
divide both sides by -4
y=2


x=-1
y=2
(x,y)
(-1,2)

the solution is (-1,2)
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