Question

Solve the system of equations and check.
3x - 4y=-15
4x + 3y=5

Answer 1

I got x=-1

Answer 2

is this right

Answer 3

3x - 4y = -15 --->(-4)
4x + 3y = 5 --->(3)
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-12x + 16y = 60 (result of multiplying by -4)
12x + 9y = 15 (result of multiplying by 3)
--------------add
25y = 75 -- divide by 25
y = 3

now sub 3 in for y in either equation to find x
3x - 4y = -15
3x - 4(3) = -15
3x - 12 = -15
3x = -15 + 12
3x = -3
x = -1

check..
4x + 3y = 5
4(-1) + 3(3) = 5
-4 + 9 = 5
5 = 5 (correct)

x = -1 and y = 5

any questions ?

Answer 4

this is the elimination way....I can do it the substitution way if you need it done that way