Your teacher is giving you a test worth 100 points containing 40 questions. There are 2-point and 4-point questions on the test. How many of each type of question are on the test?

Is this right:

the equation is 2x+4y=100
over x+y=40

I got:
2x+4y=100
-2(x+y)=40)
2x+4y=100
-2x-2y=-80
2y=20
/2 /2
y=10 you plug it back in and x+10=40 subtract 10 from 40 and x=30 (x=30, y=10

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** Edit **Thank you for editing your post AFTER I responded !