1.
8 + 4 = 12
-5 + 7 = 2
Since 12 is not equal to 2, the equation is false.
2.
y = -11x + 4
Try each ordered pair in the equation above until you find the one that makes the equation true.
Look at choice c. (1, -7)
y = -11x + 4
-7 = -11(1) + 4
-7 = -11 + 4
-7 = -7
Since (1, -7) makes the equation true, (1, -7) is the solution.
3.
Look at the lines 3, 9 and 5, 15.
The output is 3 times the input.
0, 0
1, 2
2, 6
3, 9
4, 12
5, 15
6, 18
4.
The plumber charges $65 per hour. For h hours, he charges 65h. The cost is 65h.
c = 65h