Which system of linear equations can be solved using the equation?

-8x+3y=28

4x-y=-12

Step-by-step explanation:

Let's find x and y from matrices and then check for this systems.

Simplify, so we got

7-9

28-24

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So x=-2

    y=4

So we need to put those values and check system.

x = 10.1

step-by-step explanation:

all of the angles of a tirangle add up to 180º

180 - 65 = 115 (since we already know the value of one angle)

(2x + 7) + (8x + 7) = 115

(combins like terms) 10x + 14 = 115

(isolate the variable subtract 14 from both sides): 10x = 101

(find the variable divide both sides by 10): x = 101/10

x = 10.1