Question

Solve 4x + 3y = 13
x + 5y = 33

a. (2, 7)
b. (–2, 7)
c. (2, –7)
d. (–2, –7)

Answer 1

first multiply 2nd equation by -4 and add to eliminate x
- not forgetting to multiply every term by -4

Answer 2

4x + 3y = 13
-4(x + 5y = 33)

4x + 3y = 13
-4x - 20y = -132
-17y = -119
y = 7

4x + 3(7) = 13
4x + 21 = 13
- 21 -21
4x = -8
x = -2

Answer 3

@cwrw238 did i do it right?

Answer 4

mistake in seventh line
should be 4x+ 5(7)

Answer 5

sorry - im wrong - you got it right

Answer 6

answer is b)