Question

y = 7x + 17
-x + 3y = -9

Answer 1

the answer is (-3,-4)

Explanation:

since y is equal to 7x+17, anywhere you see y, you sub 7x+17 in its position. Once you solve the equation on the bottom and get what x is equal to (-3), you sub it in anywhere you see x so that you can get your y (-4). Hope this helps

Answer 2

y=7x+17 (1)
-x+3y=-9 (2)
Step by step:
Apply y =7x +17 (1) in the second formula(2)
-x+3*(7x+17)=-9
-x+21x+51=-9
20x+51=-9
20x=-9-51
20x=-60
X=-3
Then, apply x=-3 in the first formula (1)
y=7*-3+17
y=-21+17
y= -4
The results is (x;y)=(-3;-4)