Answers:
a) x = 70
b) y = -50
c) x = 80
Explanation:
The initial equation is:
y = 5x - 300
a) y = 50
So, we need to replace y by 50 and solve for the variable x, then:
y = 5x - 300
50 = 5x - 300
50 + 300 = 5x - 300 + 300
350 = 5x
350/5 = 5x/5
70 = x
b) x = 50
Now, we need to replace x by 50 and solve for y, so:
y = 5x - 300
y = 5(50) - 300
y = 250 - 300
y = - 50
c) y = 100
We need to replace y by 100 and solve for x, so:
y = 5x - 300
100 = 5x - 300
100 + 300 = 5x - 300 + 300
400 = 5x
400/5 = 5x/5
80 = x
