Question

What's the solution to:
7x – 3y = 21
-4x + y = 2

Answer 1

do you prefer elimination or substitution ?

Answer 2

Doesn't matter but it is a system just so you know.

Answer 3

Sorry to interupt but, @texaschic101 can you help me when your done?

Answer 4

-4x + y = 2 --->(3)
7x - 3y = 21
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-12x + 3y = 6 (result of multiplying by 3)
7x - 3y = 21
-------------add
-5x = 27
x = - 27/5

now sub -27/5 in for x
-4x + y = 2
-4(-27/5) + y = 2
108/5 + y = 2
y = 2 - 108/5
y = 10/5 - 108/5
y = - 98/5

check..
-4x + y = 2
-4(-27/5) + (-98/5) = 2
108/5 - 98/5 = 2
10/5 = 2
2 = 2 (correct)

x = -27/5 and y = -98/5