How do you solve for #y# if #y= - 3x +2# when #x = -1# and #x=4#?

1 Answer
Jacob Sims
Nov 13, 2017

#y=5 and y=-10#

Explanation:

When it comes to 2 variable linear equations, it's as simple as plugging in the given values and following the order of operations. In this case, you are given two #x# values and are asked to solve for #y#.

First, you'll take one of your given values (#x=-1#) and plug it into the first formula, which is already solved for #y# (#y=-3x+2#).

#y=-3(-1) + 2#

Then follow the order of operations, remembering that two negatives equal a positive when multiplied.

#y=3 + 2#
#y = 5#

Repeat the steps for the first 2nd given value (#x=4#).

#y=-3(4) + 2#
#y=(-12) + 2#
#y=-10#

Hopefully this helps!

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