# 5x-y= 7 -3x-2y=-12 Guys, how do I get started?

2
by Twilight

2015-09-01T20:59:50+08:00
1. 5x - y = 7
x = 2
y = 3
5(2) - 3
10 - 3
= 7
2. -3x - 2y = 12
x = 2
y = 3
-3(2) - 2(3)
-6 - 6
= -12
Thank you so much
• Brainly User
2015-09-02T00:16:44+08:00

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Using substitution method to get the answer provided by Awesome Helper (and I hope that this solution stays here. Thank you.)

Equation 1)   5x - y = 7
Equation 2)  - 3x - 2y = -12

Step 1, using Equation 1
5x - y = 7
-y = -5x + 7
y = 5x - 7
Equation 3:  y = 5x - 7

Step 2: Using Equation 2, substitute 5x-7 for y
-3x - 2y = -12
-3x - 2 (5x - 7) = -12
- 3x - 10x + 14 = -12
-13x = -12 - 14
-13x = -26
-13      -13
x = 2

Step 3, Using Equation 3, substitute 2 for x
y = 5x - 7
y = 5 (2) - 7
y = 10 - 7
y = 3

The solution to this system is x = 2;  y = 3

Cool thank you so much