Answer:
3. (-4/5, -3) 6. (4, 12/-5)
Explanation:
3. so first we have
-5x - 10y = 20
-5x - 8y = 14
so first we have to have the x's be opposite so we multiply the top one by -1 which gets us
5x + 10y = -20
-5x - 8y = 14
then we cancel out the x's and subtract 10 by 8 and -20 by 14 so it's now
2y = -6
then we divide by 2 on both sides so it's
y = -3
but now we have to solve for x so we substitute y in on the bottom equation so now it is
-5x - 8(-3) = 20
now we multiply
-5x + 24 = 20
subtract 24 from both sides
-5x = -4
divide by -5
x = -4/5
then put it in coordinates
(-4/5, -3)
6. so we have
x = 4
-4x - 5y = 4
so first we have to substitute the top in for the bottom so now we have
-4(4) - 5y = 4
distribute
-8 - 5y = 4
add 8 to both sides
-5y = 12
divide
y = 12/-5
coordinates
(4, 12/-5)