substitute x=1 into y=3x+1 to find y.

Question

substitute x=1 into y=3x+1 to find y.

Answer 1

Given y = 3x + 1 find the value of y when x = 1.

y = 3(1) + 1 is the result after substituting 1 for x (the parentheses around the 1 indicate multiplication and order of operations means that we have:

y = 3 + 1

y = 4

If you visit the online Desmos graphing calculator and type y = 3x + 1 you will see that the result is a straight line and that the ordered pair (1, 4) lies on that line:

desmos.com/calculator/o5hld1qb6u

To visit the graph select the URL above, right-click, and choose "go to.." from the drop-down menu.