Juan T.

asked • 02/26/17# Y=7x+8 y=x+20

Use the substitution method to solve y=7x+8 and y=x+20

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## 1 Expert Answer

Mark M. answered • 02/26/17

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Mathematics Teacher - NCLB Highly Qualified

y = 7x + 8

y = x + 20

7x + 8 = x + 20 transitive of equality

6x + 8 = 20 subtract x from both sides

6x = 12 subtract 8 from both sides

x = 2 divide both sides by 6

David W.

tutor

Juan, the two equations are linear equations (that is, they are two lines). To "solve" means to find the (x,y) value that satisfies both equations (that is, the point where the lines intersect). x=2, and be sure to solve for y in order to put the answer into (2,?) format (that is, an ordered pair).

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02/26/17

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Juan T.

02/26/17